Power-transmission mechanism.



M. L. SBVERY & M. SGUTERUD. POWER TRANSMISSION MECHANISM.

APAPLIUATION FILED DEG. 26, 1912.

Patnted 5311.26 1915.

\X/n- EIEESES:

narrate snares ora ion MELVEN L. SEVERY LAND MIKARL SCU'TERUD, 0F ARLINGTON HEIQrHTS, MASSACHU SETTS, ASSIGNOME TO SEVERY MANUFACTURING GOMFAZ IY, 0F BOSTON, MASfiA- CHUSETTS, A CORIPORATIQlfI 0E MASSACHUSETTS.

. POWER-TRANSMISSION MECHANISM.

31,11 sailor.

Specification of Letters Eatent.

Application filed December 26,1912. Serial No. 738,526.

To all whom it may concern: V

Be it known'that we, MELVIN L. Severn", and MIKARL Soo'rnnon, both of Arlington Heights, in the, county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Power- Transmission Mechanism, of which the following is a specification.

This invention relates to an improvement in ower transmission mechanisms.

he object of the invention is to provide a variable speed device comprising a drivingmember, a driven member, andan interposed fluid, the latter being impeded or throttledin its flow through they device to vary the speed of the driven member. I

In the accompanying drawing Figure 1 is a central, vertical longitudinal section of an illustrative embodiment of the invention, and Fig. 2 is a section taken on the line 2-2inFig.1. G p

As illustrated in thedrawing, the device comprises a cylindrical chamber or drum 10 having substantially flat end walls 12 and 14, the latter of which is connected to a driven shaft 16. The cylindrical wall of the drum is provided with a filling hole closed by a screw 18, and a vent to be opened during filling but which is normally closed by a screw 20. The end Wall 12 is provided with a stuffing box 22 through which a crank-shaft 24 passes, said shaft having its right hand end slidably mounted in a cylindrical cavity 26 formed in the inner end or the driven shaft 16. The driving shaft 24: is longitudinally stationary, while the driven shaft 16 is slidable over the same longitudinally. This end of the crank-shaft is provided with a channel 28 and vent 29 which communicate with the cavity 26 to prevent the trap ing of any fluid in said cavity. The cran shaft 24 is provided with a crank-pin 30 to which a plurality of piston rods 32, are connected Although three piston rods are shown, it will be understood that any number may be employed.

The piston rods 32 are connected to pistons 34c, slidable in cylinders or holes -36 formed in a coned disk 37. Plates 38, 39 screwed to the disk 37 in which cylinders are formed engage a channel formed in the shaft 2% to prevent longitudinal movement of the cylinder member or disk 37 along said shaft, said disk being slidable on three pins outer end surfaces are in i0 which project from the inner face of the end wall 12 through holes d1 in said disk. The ends of the cylinders are open, and their the surface of cone forming the'inner conical surface of a clutch. The outer member of the clutch a conical cup-shaped member-l2 ada ted to fit over and close the ends of the cyiinders.

Patented can. as, an..

The clutch member 42 is provided with holes 44in itsjend wall 16 which provide a free circulation of the fluid 48 through the device. The clutch member 42 is shdably keyed to the driving or crank-shaft 24 by h key 50 slidable in a ey-way 51 in said shaft, and said member is rotatably fastened to the end wall 1' 1 of he drum by a plate 52, which engages an annular shoulder 54: formed on said member.

A plurality of expansible and collapsible members 60 are mounted on theiend wall 14; These maybe in the form'- of accordion-like metallic chambers each having a rod which passes through said end wall andis provided with a head 64 on its outer end: When the drum 10 is to be filled with fluid the members 60 are collapsed by drawing out the rods 62, and they 'are held in this position by sprin detents 66 which engage the heads 64. A ter the drum is filled completely with the fluid, which may be 'oil', glycerin, or any other suitable fluid, and sealed, the detents 66 are disengaged from the heads 64, and theaccordion-like' 'cham hers 60 expand under their own reciliency to of any fluid that may pass Thus the working space kept full of fluid and into the same is pre- -ward the left by the action of the shipper,

then the flow of fluid from the pistons-is impeded and they react upon the crank and tend to tie the crankshaft and piston member together, closes the cylinders entirely the clutch-member which is splined to the driving-shaft takes the full load, while at the same time its complete impedance to the flow of the out of the cylinders till and when said clutch-member Y M35 a plurality liquid causes the complete locking of crank and cylinder member together of itself.

This device is suitable for boats and the lie where a variable speed is desired, it being merely necessary to move the shipper until the desired speed is attained.

What we claim is 1. The combination of two axially alined and independently rotatable shafts; a cone clutch member connected with one of said shafts to rotate therewith and provided with of cylinder spaces having their ends open to the conical friction surface of said clutch; pistons in said cylinders; crank connections between said pistons and the second of said shafts; a complementary cone clutch member mounted to turn with said second shaft and shiftable axially with reference to the first clutch member, first to throttle the ends of said cy and then to enter into frictional driving engagement; a liquid retaining casing surrounding said clutch members; and a liquid contained in said casing and adapted to be circulated by. the reciprocation of said pistons.

ing

2. The combination of a shaft; a tight casrotatably mounted on said shaft and axlally shiftable with reference thereto; a cone clutch member mounted in said casing to rotate therewith and provided'with cylinder spaces having their ends open to the cone surface of said clutch; pistons in said cylinders; crank connections between said pistons and said shaft; a second cone clutch member splined on 'said shaft and shiftable axially thereon by the axial shifting of said :casing to exert a variable throttling action on-said open-ended cylinders and in its limiting position to enter into frictional engagement with the first named cone clutch member; and a liquid confined in said casing linder openings 3. The combination of a shaft havin a crank portion; a tight casing rotata 1y mounted on said shaft and axially shiftable with referencethereto; a cone clutch member mounted on said shaft, held thereon against axial shifting, and in driving engagement with said casing to cause the two to rotate together, said cone clutch member having cyhnders formed therein having open ends terminating on the conical friction surface of said clutch -member; pistons in said cylinders; drivin connections be tween said pistons and t e crank portion of said shaft; a second and coacting clutch member splined on said shaftand engaging said casing to be shifted axially therewith, first to throttle said cylinder openings and then to enter n? frictional engagement with the first .namedco'ne clutch member; and a liquid contained in said casing and adapted to be circulated by the reciprocation of said pistons. r

4. The combination with-two independently rotatable members, one provided with a plurality of pump cylinders having the other provided with driving connections to said pistons; Oran axially shiftable cone clutch member splined on one of said rotary members and adapted when axially shifted,

first to throttle the flow caused by the recip- EDWARD S. 0110mm, ESTHER R. Pnossmm pistons, and a 

